(19)
(11) EP 0 143 605 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.12.1985 Bulletin 1985/51

(43) Date of publication A2:
05.06.1985 Bulletin 1985/23

(21) Application number: 84308082

(22) Date of filing: 21.11.1984
(84) Designated Contracting States:
BE DE FR GB IT NL SE

(30) Priority: 29.11.1983 GB 8331860

(71) Applicant: IMPERIAL CHEMICAL INDUSTRIES PLC
 ()

(72) Inventor:
  • Smith, Peter John
     ()

   


(54) Production of ion-exchange membrane


(57) An ion-exchange membrane of a sheet of an organic polymer comprising a plurality of fixed anionic groups associated with cations which comprise an organic group, e.g. quaternary ammonium cations, a process in which the membrane sheet is expanded by dry stretching to increase the surface area per unit weight of the membrane, a process for its preparation, a process for converting the stretched membrane to one suitable for use in an electrolytic cell, and that use.





Search report